:root{
  --ink:#20252b; --body:#41474e; --muted:#6b7178; --blue:#1f6bb2; --blue-dark:#175893;
  --line:#e6e9ec; --soft:#f5f7fa;
  --font:'Inter',system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--body);background:#fff;line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:840px;margin:0 auto;padding:0 24px}

header{border-bottom:1px solid var(--line);position:sticky;top:0;background:rgba(255,255,255,.94);backdrop-filter:blur(8px);z-index:10}
.hd{display:flex;align-items:center;justify-content:space-between;height:78px;max-width:1180px;margin:0 auto;padding:0 24px}
.hd img{height:52px}
.hd .back{font-size:14.5px;font-weight:600;display:inline-flex;align-items:center;gap:7px}

main{padding:56px 0 40px}
h1{font-size:clamp(30px,4vw,42px);font-weight:800;color:var(--ink);letter-spacing:-.02em;line-height:1.12}
.sub{color:var(--muted);font-size:15px;margin-top:12px}
h2{font-size:20px;font-weight:700;color:var(--ink);margin:38px 0 12px;letter-spacing:-.01em}
h3{font-size:16px;font-weight:700;color:var(--ink);margin:22px 0 6px}
p{margin:10px 0;font-size:15.5px}
ul{margin:10px 0 10px 22px}
li{margin:5px 0;font-size:15.5px}
.rule{height:1px;background:var(--line);margin:30px 0}
.data{list-style:none;margin:14px 0;padding:0}
.data li{display:flex;gap:14px;padding:9px 0;border-bottom:1px solid var(--line);margin:0}
.data li b{flex:0 0 210px;color:var(--ink);font-weight:600}
.data li span{color:var(--body)}
.note{background:var(--soft);border:1px solid var(--line);border-left:3px solid var(--blue);border-radius:8px;padding:14px 18px;margin:18px 0;font-size:14.5px;color:var(--body)}
.todo{background:#fff7ed;border:1px solid #fed7aa;border-left:3px solid #f59e0b;border-radius:8px;padding:12px 16px;margin:12px 0;font-size:14px;color:#8a5a12}

footer{background:#20252b;color:#aab2ba;padding:40px 0;margin-top:50px}
footer .wrap{max-width:1180px}
.foot{display:flex;justify-content:space-between;flex-wrap:wrap;gap:14px;font-size:13.5px}
.foot a{color:#7db3e6}
@media(max-width:600px){
  .data li{flex-direction:column;gap:2px}
  .data li b{flex:none}
}